B3650 GMC Code - High Beam Request Signal Circuit Performance Signal Invalid
Quick Answer
The B3650 GMC code indicates that there is an issue with the High Beam Request Signal Circuit Performance Signal being invalid. Common causes include Faulty high beam switch, Wiring or connection issues in the high beam circuit, Defective high beam relay. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B3650 GMC indicates High Beam Request Signal Circuit Performance Signal Invalid.
- Common causes
- Common causes include Faulty high beam switch, Wiring or connection issues in the high beam circuit, Defective high beam relay.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code B3650 GMC Description
The B3650 GMC code indicates that there is an issue with the High Beam Request Signal Circuit Performance Signal being invalid. In simpler terms, this means that the vehicle's high beam system is not functioning properly. The high beam request signal is a crucial component of the vehicle's lighting system, as it controls when the high beams are activated. When this signal is invalid, it can lead to various issues with the vehicle's lighting system, affecting visibility during night driving and potentially compromising safety.
Common Causes of B3650 GMC
- Faulty high beam switch.
- Wiring or connection issues in the high beam circuit.
- Defective high beam relay.
- Malfunctioning body control module (BCM).
- Electrical issues such as a short circuit or open circuit in the high beam system.
Symptoms of B3650 GMC
- High beams not turning on when activated.
- High beams flickering or dimming unexpectedly.
- Dashboard warning light indicating a high beam system issue.
- Inconsistent high beam performance.
How to Fix B3650 GMC
- Begin by conducting a visual inspection of the high beam switch, wiring, and connections to check for any visible damage or loose connections.
- Test the high beam relay to determine if it is functioning correctly. Replace the relay if necessary.
- Use a multimeter to test the continuity of the high beam circuit and identify any wiring or connection issues. Repair or replace damaged components as needed.
- If the issue persists, diagnose the BCM to determine if it is sending the correct signals to the high beam system. Replace the BCM if it is found to be faulty.
- Clear the diagnostic trouble codes from the vehicle's system and test the high beams to ensure they are functioning properly.
Cost to Fix B3650 GMC
The typical repair costs for addressing the B3650 GMC code can vary depending on the specific cause of the issue. In general, the cost of parts such as a high beam relay or a new BCM can range from $50 to $300, while labor costs can add an additional $100 to $300. Overall, the total repair cost for this issue could range from $150 to $600. It is important to note that these are rough estimates, and actual costs may vary based on factors such as the vehicle's make and model, the location of the repair shop, and the extent of the repairs needed. It is recommended to consult with a qualified mechanic to get a more accurate cost estimate for addressing the B3650 code.
Need more information about the B3650 GMC code?
Need more information on how to fix the B3650 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B3650 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- B3650 2014 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
- B3650 2015 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
- B3650 2016 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
- B3650 2017 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
- B3650 2018 GMC Sierra — High Beam Request Signal Circuit Performance Signal Invalid
Frequently Asked Questions about B3650 GMC Code
1. What does the OBDII code B3650 on a GMC mean?
The B3650 code indicates an issue with the High Beam Request Signal Circuit, where the signal is deemed invalid by the vehicle's control module.
2. What are the common symptoms of a B3650 code on a GMC?
Symptoms may include high beams not functioning, the high beam indicator on the dashboard not illuminating, or intermittent high beam operation.
3. What causes the B3650 code to appear on a GMC vehicle?
Common causes include a faulty high beam switch, damaged wiring or connectors in the high beam circuit, or a malfunctioning body control module (BCM).
4. Can a blown fuse cause the B3650 code on a GMC?
Yes, a blown fuse in the high beam circuit can disrupt the signal and trigger this code.
5. How can I diagnose the B3650 code on my GMC?
Start by inspecting the high beam switch, checking for damaged or corroded wiring, and testing the functionality of the circuit with a multimeter. If no issues are found, the BCM may need further evaluation.
6. Is the high beam switch the most common cause of the B3650 code?
Yes, a faulty or stuck high beam switch is one of the most common causes of this code.
7. Can I still drive my GMC with the B3650 code active?
Yes, you can drive the vehicle, but your high beams may not work properly, which could affect nighttime visibility and safety.
8. How do I fix the B3650 code on my GMC?
Repairs may include replacing the high beam switch, repairing or replacing damaged wiring, or reprogramming or replacing the body control module if necessary.
9. How much does it cost to repair a B3650 code on a GMC?
Repair costs vary depending on the cause but typically range from $50 to $300, including parts and labor, with BCM replacement being on the higher end.
10. Do I need to clear the code after fixing the issue?
Yes, after repairs, use an OBDII scanner to clear the code and confirm the fix by checking if the code reappears.
Discuss the causes and fixes for B3650 GMC OBDII Code
Code B3650 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.